apt-get -y upgrade
apt-get -y autoremove
apt-get -y clean

echo "cleaning up guest additions"
rm -rf VBoxGuestAdditions_*.iso VBoxGuestAdditions_*.iso.?

echo "cleaning permissions"
chown -R ${SSH_USERNAME}:${SSH_USERNAME} /home/${SSH_USERNAME}

# Remove some packages to get a minimal install
echo "==> Removing all linux kernels except the current one"
dpkg --list | awk '{ print $2 }' | grep 'linux-image-*-generic' | grep -v $(uname -r) | xargs apt-get -y purge
echo "==> Removing linux source"
dpkg --list | awk '{ print $2 }' | grep linux-source | xargs apt-get -y purge
echo "==> Removing documentation"
dpkg --list | awk '{ print $2 }' | grep -- '-doc$' | xargs apt-get -y purge
echo "==> Removing default system Ruby"
apt-get -y purge ruby ri doc
echo "==> Removing obsolete networking components"
apt-get -y purge ppp pppconfig pppoeconf
echo "==> Removing other oddities"
apt-get -y purge popularity-contest installation-report landscape-common wireless-tools wpasupplicant

# Clean up the apt cache
apt-get -y autoremove --purge
apt-get -y autoclean
apt-get -y clean

echo "removing man pages"
rm -rf /usr/share/man/*
echo "removing APT files"
find /var/lib/apt -type f | xargs rm -f
echo "removing any docs"
rm -rf /usr/share/doc/*
echo "removing caches"
find /var/cache -type f -exec rm -rf {} \;

echo "cleaning up tmp"
rm -rf /tmp/*

# Remove Bash history
unset HISTFILE
rm -f /root/.bash_history
rm -f ${SSH_USER_HOME}/.bash_history

# Clean up log files
find /var/log -type f | while read f; do echo -ne '' > "${f}"; done;

echo "clearing last login information"
>/var/log/lastlog
>/var/log/wtmp
>/var/log/btmp

echo "whiteout /"
count=$(df --sync -kP / | tail -n1  | awk -F ' ' '{print $4}')
let count--
dd if=/dev/zero of=/tmp/whitespace bs=1024 count=$count
rm /tmp/whitespace

echo "whiteout /boot"
count=$(df --sync -kP /boot | tail -n1 | awk -F ' ' '{print $4}')
let count--
dd if=/dev/zero of=/boot/whitespace bs=1024 count=$count
rm /boot/whitespace

echo "clear out swap and disable until reboot"
set +e
swapuuid=$(/sbin/blkid -o value -l -s UUID -t TYPE=swap)
case "$?" in
    2|0) ;;
    *) exit 1 ;;
esac
set -e
if [ "x${swapuuid}" != "x" ]; then
    # Whiteout the swap partition to reduce box size
    # Swap is disabled till reboot
    swappart=$(readlink -f /dev/disk/by-uuid/$swapuuid)
    /sbin/swapoff "${swappart}"
    dd if=/dev/zero of="${swappart}" bs=1M || echo "dd exit code $? is suppressed"
    /sbin/mkswap -U "${swapuuid}" "${swappart}"
fi

echo "whiteout free space"
dd if=/dev/zero of=/EMPTY bs=1M  || echo "dd exit code $? is suppressed"
rm -f /EMPTY

sync

echo "disk usage"
df -h